8.6 Configuring the Modbus interface
The Modbus parameters can be set on the internal display, the service tools
Chapter 8.2 ‘Service tools functional
or an external Modbus software.
The following table lists all Modbus registers and their meaning.
Explanation of the access right / storage:
R = Register can be read
R, W = Register can be read and written
RAM = Register value temporary
EEPROM = Register value not temporary, but saved permanently (max. 1 million write processes)
Register
Meaning
Access right
Storage
0
Volume flow rate setpoint value [%]
Reference: Vmin – Vmax (q
vmin
– q
vmax
)
Resolution: 0 – 10000
Volume flow rate setpoint value: 0.00 – 100.00%
R, W
RAM
1
Activation of an override control
0 = None
1 = OPEN position
2 = CLOSED position, shut-off CLOSED
3 = q
vmin
4 = q
vmax
R, W
RAM
2
Command triggering
0 = None
1 = Synchronisation
2 = Test run
4 = Controller reset
R, W
RAM
4
Current damper blade position [%]
Resolution: 0 – 10000
Damper blade position: 0.00 – 100.00%
R
RAM
5
Current damper blade position [°]
Reference: without decimal places
R
RAM
6
Volume flow rate actual value [%]
Reference: q
vnom
Resolution: 0 – 10000
Volume flow rate actual value: 0.00 – 100.00%
R
RAM
7
Current volume flow rate actual value in volume flow unit according to
the setting in register 201 [m³/h], [l/ s], [cfm]
R
RAM
8
Voltage value at analogue input setpoint value Y [mV]
R
RAM
103
Firmware version
R
Flash
104
Status information
Bit 5 = Mechanical overload
Bit 8 = Internal activity, e. g., test run, synchronisation
Bit 10 - Bus timeout monitoring triggered
Note:
All other bits for internal purposes only
R
RAM
Commissioning and operation
Configuring the Modbus interface
Control component Compact XM0 • XS0 for VAV terminal unit TVE
30